gecko: double-click on tab bar crashfix for some WMs

Obtained from:	upstream (Firefox 58)
PR:		222693
Submitted by:	tobik
MFH:		2017Q4

1 files changed, 41 insertions, 0 deletions

diff --git a/www/firefox-esr/files/patch-bug1186967 b/www/firefox-esr/files/patch-bug1186967
new file mode 100644
index 000000000000..26d304fbd3e9
--- /dev/null
+++ b/www/firefox-esr/files/patch-bug1186967
@@ -0,0 +1,41 @@
+commit 64bb4e051b50
+Author: Martin Stransky <stransky@redhat.com>
+Date:   Tue Oct 17 09:50:18 2017 +0200
+
+    Bug 1186967 - ignore double-click on WM without _NET_WM_MOVERESIZE support, r=jhorak
+    
+    MozReview-Commit-ID: 2Vs6i5leero
+    
+    --HG--
+    extra : rebase_source : d8f2bbaf9ef9b2025478f029a68ee7e87e07de79
+---
+ widget/gtk/nsWindow.cpp | 16 ++++++++++++++++
+ 1 file changed, 16 insertions(+)
+
+diff --git widget/gtk/nsWindow.cpp widget/gtk/nsWindow.cpp
+index eb2f0e5e95cd..955327297ac9 100644
+--- widget/gtk/nsWindow.cpp
++++ widget/gtk/nsWindow.cpp
+@@ -6444,6 +6444,22 @@ nsWindow::GetDragInfo(WidgetMouseEvent* aMouseEvent,
+         return false;
+     }
+ 
++    if (mIsX11Display) {
++      // Workaround for https://bugzilla.gnome.org/show_bug.cgi?id=789054
++      // To avoid crashes disable double-click on WM without _NET_WM_MOVERESIZE.
++      // See _should_perform_ewmh_drag() at gdkwindow-x11.c
++      GdkScreen* screen = gdk_window_get_screen(gdk_window);
++      GdkAtom atom = gdk_atom_intern("_NET_WM_MOVERESIZE", FALSE);
++      if (!gdk_x11_screen_supports_net_wm_hint(screen, atom)) {
++          static unsigned int lastTimeStamp = 0;
++          if (lastTimeStamp != aMouseEvent->mTime) {
++              lastTimeStamp = aMouseEvent->mTime;
++          } else {
++              return false;
++          }
++      }
++    }
++
+     // FIXME: It would be nice to have the widget position at the time
+     // of the event, but it's relatively unlikely that the widget has
+     // moved since the mousedown.  (On the other hand, it's quite likely